The brown plant hopper is a major pest of rice crops, causing significant damage to the leaves and stems of the plant.

Late blight disease in potatoes is caused by the oomycete Phytophthora infestans, which affects the leaves, stems, and tubers of the plant.

Rust is a common fungal disease that affects wheat crops, causing yellow or brown spots on the leaves and stems of the plant.

Citrus tristeza virus is transmitted by aphids, which feed on the sap of citrus trees and spread the virus to healthy plants.

Bacterial wilt is a bacterial disease that affects tomato plants, causing the leaves to wilt and die.

Powdery mildew is caused by a group of fungi belonging to the genus Erysiphe, with Erysiphe cichoracearum being a common species that affects a wide range of plants.

Weevils are common pests that attack stored grains, causing damage to the kernels and reducing their quality.

Downy mildew in grapes is caused by the oomycete Plasmopara viticola, which affects the leaves and fruit of the plant.

Red rot is a fungal disease that affects sugarcane crops, causing a reddish-brown discoloration of the stalks and reducing the sugar content.

Cucumber mosaic virus is transmitted by aphids, which feed on the sap of cucurbit plants and spread the virus to healthy plants.

The boll weevil is a major pest of cotton crops, causing damage to the bolls and reducing the yield of cotton lint.

Black rot in crucifers is caused by the bacterium Xanthomonas campestris pv. campestris, which affects the leaves, stems, and pods of the plant.

Anthracnose is a fungal disease that affects mango trees, causing dark spots on the leaves, fruits, and twigs of the tree.

Papaya ringspot virus is transmitted by aphids, which feed on the sap of papaya plants and spread the virus to healthy plants.

Bruchids are common pests that attack stored pulses, causing damage to the seeds and reducing their quality.